For consumer products, what are the best questions to ask users who signed up and eventually didn't retain?<p>For most of them, I'm having troubles getting them on the phone (understandably), what are some short quick questions that are good to ask to learn from users who don't retain?
For example, pretend you run product at Twitter and you want to learn from the people in your target demographic who don't come back regularly to Twitter after signing up. What would you ask them to get good/useful product feedback?
Perhaps it would help to know what the product is.<p>Otherwise the only generic questions I can think of are:
What made you leave?
What change in our product would have convinced you to stay?<p>This is outside my area of expertise.